Whatsapp On 2 Devices. But yeah you can. Officially its not yet possible to use the same WhatsApp account on two devices at the same time.
For iphone users you can do something called MAC spoofing. To be able to have the same WhatsApp account on two phones tablets iPads. At a particular point in time you can only use the same account on one device only.
Tap on it and press Join beta to join WhatsApps multi-device beta program.
Now under the new beta program you can use WhatsApp Business app on 5 devices of 1 phone 4 additional devices for each number. If you cannot use WhatsApp business on multiple devices then one option would be to simply use multiple WhatsApp businesses on a single device using Parallel Space. You could only use WhatsApp Business app on a maximum of two devices at the same time before September 2021. U can actually hack someones account by this.